One Direction fans threaten to kill Niall's new girlfriend

ITEM: The relationship became public knowledge when the two lovebirds were spotted snogging in a casino [SPLASH NEWS ]

Melissa Whitelaw was bombarded with abuse by Directioners vowing to “f*** her up” after she was seen snogging the singer in a casino.

Last night an account, believed to be hers, launched an appeal on Instagram for fans to “please stop” sending her jibes. Melissa, 21, begged: “I haven’t done anything to any of you so please stop sending me mean comments.”

It came after the brunette was spotted getting cosy with Niall, 21, as he kicked off One Direction’s new tour in Australia.

She was snapped leaving a private jet with the singer when he touched down in Sydney for two nights of shows.

Melissa added on her @edgeofmydesire account: “For all you asking yeah Niall and I dating. Niall has not posted about it because we have decided we will wait until it’s the right time.”

THREATENED: Melissa,21, had to use her social media to plead with angry 1D fans [IG ]

But the backlash continued from Niall’s admirers.

One said: “Someone said to me Melissa and Niall look cute together. Let’s just say I will not be showing at her funeral and I did not kill her.”

Another added: “Directioners are millions. If you break his heart you’ll be f***ed up. Leave him.”

It came after Niall partied in Melbourne on Saturday with 1D lads Harry Styles, 21, and Zayn Malik, 22.

And bandmates Liam Payne, 21, and Louis Tomlinson, 23, also had a wild night.

Liam told the crowd at Etihad Stadium the next day his tired appearance was down to their “extraordinary night out”.